Halak, 28, split his eighth NHL season between St. Louis and Washington, compiling a 29-13-7 record. The native of Slovakia was acquired by New York from Washington for a fourth-round draft pick and could have become a free agent.

Halak won the Jennings Trophy in 2011-12 for helping St. Louis allow the fewest goals in the league. He has a 144-85-29 record with a 2.38 goals-against average, a .918 save percentage and 30 shutouts.

The Islanders also will retain their first-round selection in this year’s draft, instead sending their top pick in 2015 to Buffalo to complete a previous trade for Thomas Vanek. The selection, at the Islanders‘ option, was packaged in the team’s deal for Vanek on Oct. 27, 2013.